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研究论文

REDOX POTENTIAL OF SELENIUM IN YONGSHOUKASCHIN-BECK DISEASE REGION AND THE INFLUENCEOF HUMIC ACID ON EH [Se(VI)/Se(IV)]

摘要：以大骨节病病区土壤溶液环境为背景,研究了土壤溶液中E_H[Se（Ⅵ）/Se（Ⅳ）]—pH关系及天然环境中主要的氧化还原剂腐殖酸、MnO₂、Fe²⁺等对硒氧化还原性质的影响。腐殖酸和Fe²⁺可提高Se（Ⅵ）/Se（Ⅳ）体系的还原能力,MnO₂对Se（Ⅳ）有一定的氧化作用,而腐殖酸和Fe²⁺只有在低pH条件下才对Se（Ⅵ）有弱的还原作用。几种含硫化合物还原Se（Ⅵ）的能力依次为:硫

Abstract：The relation between EH [Se(VI)/Se(IV)] and pH of soil solution in Kaschin-Beck Disease region and the effects of natural redox agents, namely humic substances, MnO₂ and Fe²⁺, on the redox property of the system were studied. The results indicated that both humic acid and Fe²⁺ could enhance the reducibility of Se(VI)/Se (IV) and MnO₂ had alimited dxidisability for Se(IV). Fe²⁺ showed a week reducibility only at low pH value. The reducibilities of three sulfur-containing compounds for Se(VI) were in following order.sulfo-ethanol acid > L-cystine > sulfide.